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Letters Patent No. 71,251, dated November 19, 1867. i

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TO ALL PERSONS TO WHOM THESE PRESENTS SHALL COME:

' Be it known that I, Ronnnr L. WALKER, of Globe Village, in the county of Worcester, and Stato of Massachusetts, have invented a new and useful Improvement in Water-Gratos for Furnaces; and I do hereby declare the same to be fully' described in the following specification, and represented in the accompanying drawings, of

which- Figure 1 is a horizontal section,

Figure 2 a longitudinal section, and l Figure 3 a transverse section of a grate made with my improvement.

This grate is constructed with a water-channel through each ci' its bars. This, however, I do not claim as my invention, it being anvold principle of making a grate, for preventing its bars from being destroyed or injured bythe heat ofthe fuel of the fireplace or furnace of such grate.

i My invention or improvement consists in a peculiar construction of a grate with water-passages through its bars, and may be thus described In the drawings, A A A, Sto., denote the several bars of the grate, each having a water-passage, a, running longitudinally through it, the spaces between the several grate-bars, as shown at Z1 b b, Sto., such bars being arranged parallel to each other.

The water is to be led into one end of the water-passage of the middle grate-bar. At its other end, this passage opens by lateral curved passages e c into the two ends of the two next passages a a, situated on opposite sides ofsuchmiddle passage. Next, each of these latter passages, at its other end, opens, by curved passages ot d into the next' adjacent passages, which in turn, at their opposite ends, open into the next adjacent passages, the whole being as represented. Each passage of the grate, except the middle one and the two external passages, opens at its opposite ends vinto the two passages on its flanks. Finally, both ofthe external passages lead into a common passage, e, extending across the grate, in manner as represented in fig. 1. An opening,f, for thc conveyance of the water to the boiler of the furnace,'leads out ofthe middle of thc passage e.

The upper. portion of each gratebar, instead' of being made ilat, in the usual manner, is bevelled or made triangular or traperoidal in section, as exhibited at g, such being to prevent ashes from accumulating on thc bars, as well as to direct coals and cin'ders from the fuel into the spaces between the bars.

A fter the waterV may have been forced-into the grate so made, such wa'ter will travel through the middle passage, andthence branch in opposite directions, and go through each half of the grate, and finally into the passage e, from which it will be discharged.' Were it caused to pass from the first to-the last passage through one entire serpentine course, it would be likely to become too much heated, so as to be converted into steam, whereby the grate would be maintained at an uneven temperature; but, by rst passing the water into the middle passage or bar of the grate, and thence causing it to travel in opposite directions into the next two bars,

on opposite sides of such middle-bar passage, and thence through the other bars, and finally into the common cross-passage e, the grate willbc maintained at an even temperature, and the heat will be abstracted from it by the water to better advantage.

I make no claim to a grate composed of a serpentine pipe, as shown in Eli Thayers patent, No. 47,053, dated March 28, 1865; nor do I claim a grate havinga watertrough underneath its bars, the same being as represented in Letters Patent, No. 3,671, dated July 19, 1844, and4 granted to John Kymcr. My invention differs materially therefrom, as my improved grate, as constructed, not only has two serpentine passages leading4 through its bars and out of one end of a passage leadingthrough its middle bar, which is open at its opposite end, but it has a common transverse passage, c, which communicates with the two serpentine passages a a, and has a discharge-opening,j`, at its middle. This construction of the grate, besides imparting to it advantages as above stated, enables it to be supported by and so as to be turned on journals extending from the middles ot' its opposite ends, in which case the induction and eduction pipes of communication vwith the grate would have to lead into such journals, and be so applied thereto as to enable the grate to be turned or revolved.

What, therefore, I claim as my invention is- A water-grato, made with the passage into and through its middle bar, and with the two serpentine passages (t a leading from ono end of such bar'in opposite directions, and through the other bars, as specified.

I also claim a water-grato, as made not only with the passage into and through its middleibar, and with two serpentine passages a leading from one end oi such bar in opposite directions, through the other bars, but with a common transverse passage, c, provided with a discharge-opening, f, as described.

ROBERT L. WALKER.

Witnesses:

It. H. EDDY, F. l. HALE, Jr. 

